That’s how it actually works, right? They have something more akin to a hydraulic system, than a muscular system. I think all the pressure would be stored in the trunk, right?

Edit: never mind, I’m thinking of arachnids, not insects.

https://en.m.wikipedia.org/wiki/Arachnid_locomotion

Ants have muscles:

https://www.nytimes.com/2007/11/20/science/20qna.html

They both use hemolymph but only arachnids use them as hydraulics.